Abstract: Four wastematerials, paper,wood, textile and kitchen garbage, inmunicipal solidwastewere gasified separately with oxygen in a fixed bed reactor. The yields of products char, tar and gas, the composition of gas components H₂, CO,CO₂ and CH₄, and the lower heating value (LHV)were examined at temperatures between 700 and 900℃ and equivalence ratio (ER) between 0.14 and 0.32. Characteristics of gas evolution during gasification were investigated. Results show that a higher temperature improves the formation of H₂ and CO while lowers the yield of CO₂ and CH₄. The LHV of syngas increases with temperature and varies in the range of 6-10 MJ·m^-3, reaching the maximum at 800℃ or above. As ER increases, both combustible gas component and LHV of syngas decrease while the yield of CO₂ rises linearly. The appropriate ER for obtaining high quality gas is in the range of 0.18-0.23. Temperature and ER have significant effects on the product distribution. Higher temperature and ER are favorable for higher gas yield and lower yield of char and tar in the gasification of textile and kitchen garbage. At 800℃, the gas evolution may be divided into two regions. In the first region, the flow rate of gas increases and then decreases rapidly, while in the second region the flow rate decreases monotonically to lower level.

Key words: Municipal solid waste, Oxygen gasification, Temperature, Equivalence ratio, Gas flow rate

摘要： Four wastematerials, paper,wood, textile and kitchen garbage, inmunicipal solidwastewere gasified separately with oxygen in a fixed bed reactor. The yields of products char, tar and gas, the composition of gas components H₂, CO,CO₂ and CH₄, and the lower heating value (LHV)were examined at temperatures between 700 and 900℃ and equivalence ratio (ER) between 0.14 and 0.32. Characteristics of gas evolution during gasification were investigated. Results show that a higher temperature improves the formation of H₂ and CO while lowers the yield of CO₂ and CH₄. The LHV of syngas increases with temperature and varies in the range of 6-10 MJ·m^-3, reaching the maximum at 800℃ or above. As ER increases, both combustible gas component and LHV of syngas decrease while the yield of CO₂ rises linearly. The appropriate ER for obtaining high quality gas is in the range of 0.18-0.23. Temperature and ER have significant effects on the product distribution. Higher temperature and ER are favorable for higher gas yield and lower yield of char and tar in the gasification of textile and kitchen garbage. At 800℃, the gas evolution may be divided into two regions. In the first region, the flow rate of gas increases and then decreases rapidly, while in the second region the flow rate decreases monotonically to lower level.

关键词: Municipal solid waste, Oxygen gasification, Temperature, Equivalence ratio, Gas flow rate